摘要
本文利用光电子能谱(ESCA)和表面接触角研究了多嵌段聚硅氧烷聚脲共聚物(PUSE)和双离子型聚硅氨酯(PUSM)的表面性质,发现PUSE和PUSM中的软段聚硅氧烷均在表面富集;提高本体的相分离程度,更有利于软段的表面富集;但在50层内,硬段仍有一定的比例,表面层仍是多相结构。在PUSE中,接触角和凝血时间随聚硅氧烷软段比例增加而增加,在PUSM中,随离子化程度的提高,亲水性提高,接触角变小,凝血时间缩短。
The surface properties of polysiloxane-polyurea block copolymers (PUSE) and polysiloxane-polyurethane (PUSM) zwitterionomers have been investigated by ESCA and analysis of surface contact angle. It was found that the soft segment of polysiloxane richened on the surface of PUSE and PUSM. The increase of phase segregation would be advantageous to the further richness of polysiloxane on the surface. However, in the surface layer of about 50 A there was still a certain proportion of hard segment and the surface layer remained a heterogeneous structure. In the case of PUSE, as the proportion of both bulk and surface hard segment increased, the contact angle and the time of forming thrombus linearly decreased. In PUSM because of an increase of zwitterions, the contact 'angle was reduced and time of forming thrombus was shortened.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1989年第3期280-283,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
聚硅氧烷聚脲
离子型
聚氨酯
Polysiloxane-polyurea block copolymer, Polysiloxane-polyurethane zwitterionomer , Surface property
